31212278112 has 48 divisors (see below), whose sum is σ = 82969367040. Its totient is φ = 10272392832.

The previous prime is 31212278093. The next prime is 31212278113. The reversal of 31212278112 is 21187221213.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 31212278112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212278113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050188 + ... + 2065355.

It is an arithmetic number, because the mean of its divisors is an integer number (1728528480).

Almost surely, 2^31212278112 is an apocalyptic number.

31212278112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31212278112 is an abundant number, since it is smaller than the sum of its proper divisors (51757088928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31212278112 is a wasteful number, since it uses less digits than its factorization.

31212278112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115635 (or 4115627 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

Adding to 31212278112 its reverse (21187221213), we get a palindrome (52399499325).

The spelling of 31212278112 in words is "thirty-one billion, two hundred twelve million, two hundred seventy-eight thousand, one hundred twelve".